LED light bulb having filament with being partially coated by light conversion layer
US11121292B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2019 |
| Grant date | Sep 14, 2021 |
| Priority date | — |
| Expiry date | Oct 31, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8513
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED light bulb, consisting of: a lamp housing doped with a golden yellow material or its surface coated with a yellow film; a bulb base connected to the lamp housing; a stem connected to the bulb base and located in the lamp housing, the stem comprises a stand extending to the center of the lamp housing; and a single LED filament, disposed in the lamp housing, the LED filament comprising: a light conversion layer, coated on at least two sides of the LED chip and the conductive electrodes, and a portion of each of the conductive electrodes is not coated with the light conversion layer, the light conversion layer has at least one top layer and one base layer, the top layer and the base layer are disposed on the opposing surface of the LED chip, wherein the top layer of the light conversion layer in the conductive section comprises a wavy concave structure with groove, the two adjacent grooves of the wavy concave structure have different width at the positions aligned in the axial direction of the LED filament.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.